Japan is the most sexless country in the world. According the the Japanese Medical Association, the definition of "sexlessness" is: "a couple that, without diagnosed 'special circumstances' (i.e., ED or other physical or mental issues), engages in consensual sex once a month or less."

The average Japanese couple has sex 17 times a year, and a whopping 33.9% are "sexless."
The well-cited Durex survey of annual number, by country, of fornication is noted below: